RESUMO
We report first observations of B(s)(0) â J/ψη and B(s)(0) â J/ψη'. The results are obtained from 121.4 fb(-1) of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+ e- collider. We obtain the branching fractions B(B(s)(0) â J/ψη)=[5.10±0.50(stat)±0.25(syst)(-0.79)(+1.14)(N(B(s)(*) B(s)(*))]×10(-4), and B(B(s)(0) â J/ψη')=[3.71±0.61(stat)±0.18(syst)(-0.57)(+0.83)(N(B(s)(*) B(s)(*))]×10(-4). The ratio of the two branching fractions is measured to be (B(B(s) â J/ψη'))/(B(B(s) â J/ψη))=0.73±0.14(stat)±0.02(syst).
Assuntos
Partículas Elementares , Teoria QuânticaRESUMO
We report the observation of B(s)°âJ/ψf0(980) and evidence for B(s)°âJ/ψf0(1370), which are CP eigenstate decay modes. These results are obtained from 121.4 fb⻹ of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e(+)eâ» collider. We measure the branching fractions B(B(s)°âJ/ψf0(980); f0(980)âπ(+)πâ»)=(1.16(-0.19)(+0.31)(stat)(-0.17)(+0.15)(syst)(-0.18)(+0.26)(N(B(s)((*))B(s)((*)))))×10â»4 with a significance of 8.4σ, and B(B(s)°âJ/ψf0(1370); f0(1370)âπ(+)πâ»)=(0.34(-0.14)(+0.11)(stat)(-0.02)(+0.03)(syst)(-0.05)(+0.08)(N(B(s)((*))B(s)((*)))))×10â»4 with a significance of 4.2σ. The last error listed is due to uncertainty in the number of produced B(s)((*))B(s)((*)) pairs.